TWI610213B - Mutual capacitive touch panel - Google Patents

Abstract

The invention provides a mutual-capacitive touch panel, which includes at least one touch sensing group extending along a first direction, and the touch sensing group includes a plurality of first electrodes, a plurality of second electrodes, and a plurality of third Electrodes and a plurality of fourth electrodes. The first electrodes are electrically connected to each other, and the second electrodes are electrically connected to each other, wherein each first electrode and each second electrode are alternately arranged in sequence along the first direction. The third electrode and the fourth electrode are arranged along the first direction, respectively. A third electrode and an adjacent fourth electrode are respectively disposed on one side of the corresponding first electrode and one side of the corresponding second electrode and are electrically connected to each other.

Description

Mutual capacitance touch panel

The invention relates to a mutual capacitance touch panel, in particular to a single-layer mutual capacitance touch panel which can reduce the number of pads.

With the rapid development of technology, touch panels have been widely used in smart phones, GPS navigator systems, tablet PCs and laptops due to their human-computer interaction. PC) and other electronic products. The touch sensing element of the conventional mutual-capacitive touch panel is composed of a plurality of driving electrodes and a plurality of sensing electrodes, and the two are staggered. In order to avoid electrical connection between the two, the driving electrode and the sensing electrode are formed by two conductive layers. However, the formation of the touch sensing element through two conductive layers also requires an insulating layer to be insulated between them, so the thickness of the touch panel is undoubtedly limited in the design trend of thinner and thinner. To this end, a mutual-capacitive touch sensing element with a single-layer structure has been developed.

The traditional single-layer structure of a mutual-capacitive touch sensing element is composed of a sensing electrode and a driving electrode, and each sensing electrode is provided corresponding to a driving electrode, so that a different unit of each driving electrode and the sensing electrode forms a sensing unit . Although the single-layer structure of the touch sensing element can reduce the thickness of the touch panel, each sensing electrode and each driving electrode of this design must be electrically connected to corresponding pads through wires, respectively. Therefore, compared to the two-layer conductive sensing device, the number of pads is greatly increased; this not only causes a load on the driving element, but also a flexible circuit board for electrically connecting the pad and the driving element must be designed as With more traces and a larger area, the manufacturing cost of the flexible circuit board is increased and the design is difficult.

One of the objectives of the present invention is to provide a mutual-capacity touch panel to reduce the number of pads.

An embodiment of the present invention provides a mutual-capacity touch panel, including a substrate and at least one touch sensing group. The substrate has a first side and a second side opposite to each other. The touch sensing group extends on the substrate along a first direction, and the touch sensing group includes a plurality of first electrodes, a plurality of second electrodes, a plurality of third electrodes, and a plurality of fourth electrodes. The first electrodes are arranged along the first direction, and are electrically connected to each other. The second electrodes are arranged along the first direction and are electrically connected to each other, wherein each first electrode and each second electrode are sequentially arranged alternately along the first direction. The third electrodes are arranged along the first direction, and the third electrodes are disposed on the side of the corresponding first electrode facing the first side, and form a first sensing unit with the corresponding first electrode. The fourth electrodes are arranged along the first direction, and the fourth electrode adjacent to the third electrode is disposed on a side of the corresponding second electrode facing the second side, and forms a second sensing with the corresponding second electrode Unit, and the third electrode and the adjacent fourth electrode are electrically connected to each other.

Please refer to FIG. 1, which illustrates a schematic top view of a mutual-capacitive touch panel according to the first embodiment of the present invention. In order to clearly show the structure of the mutual-capacity touch panel, the touch panel shown in FIG. 1 is only an illustration, and its size and ratio are not limited to those shown. As shown in FIG. 1, the mutual-capacitive touch panel 100 of this embodiment includes a substrate 102 and a touch sensing element 104. The substrate 102 may have a first side S1 and a second side S2 opposite to each other, and the substrate 102 may further have a sensing area SR and a peripheral area PR. In this embodiment, the peripheral area PR surrounds the sensing area SR, but it is not limited thereto. For example, the substrate 102 may include a hard substrate or a flexible substrate, such as a glass substrate, a strengthened glass substrate, a quartz substrate, a sapphire substrate, a hard cover lens, a plastic substrate, a flexible cover plate, a flexible plastic substrate, and a thin glass substrate Or a substrate of a display, and the substrate of the above display may be a color filter substrate of a liquid crystal display or a packaging cover of an organic light emitting display, but it is not limited thereto. The touch sensing element 104 is disposed on the substrate 102 and includes at least one touch sensing group 106 extending along the first direction D1. In this embodiment, the touch sensing element 104 may include a plurality of touch sensing groups 106 arranged along the second direction D2.

Each touch sensing group 106 includes a plurality of first electrodes E1, a plurality of second electrodes E2, a plurality of third electrodes E3, and a plurality of fourth electrodes E4, which are disposed on the substrate 102 in the sensing area SR. For a single touch sensing group 106, each first electrode E1 and each second electrode E2 are alternately arranged in sequence along the first direction D1. The first electrodes E1 are electrically connected to each other, the second electrodes E2 are electrically connected to each other, and the first electrodes E1 and the second electrodes E2 are electrically insulated from each other. Specifically, each touch sensing group 106 may further include a plurality of first connection lines C1 and a plurality of second connection lines C2, which are disposed on the substrate 102 in the sensing area SR. Each first connection line C1 is connected between any two adjacent first electrodes E1 and extends to a side of the corresponding second electrode E2 facing the first side S1 to connect the same touch sensing group 106 The first electrodes E1 are electrically connected in series to form a first electrode series. Each second connection line C2 is connected between any two adjacent second electrodes E2 and extends to a side of the corresponding first electrode E1 facing the second side S2 to connect the same touch sensing group 106 The second electrode E2 is electrically connected in series to form a second electrode series.

Furthermore, the third electrodes E3 are arranged along the first direction D1 and are electrically insulated from each other. Each third electrode E3 is disposed on the side of the corresponding first electrode E1 facing the first side S1 and is separated from a portion of the corresponding first electrode E1 by an interval to generate capacitive coupling, so that each third The electrode E3 and a corresponding part of the first electrode E1 respectively form a first sensing unit SU1. The fourth electrodes E4 are arranged along the first direction D1 and are electrically insulated from each other. Each fourth electrode E4 is disposed on a side of the corresponding second electrode E2 facing the second side S2 and separated from a portion of the corresponding second electrode E2 by an interval to generate capacitive coupling, so that each fourth The electrode E4 and a corresponding part of the second electrode E2 respectively form a second sensing unit SU2. It is worth mentioning that each third electrode E3 and the adjacent fourth electrode E4 are electrically connected to each other to form an electrode unit. Moreover, the third electrodes E3 arranged in the same row of different touch sensing groups 106 arranged in the second direction D2 are electrically connected to each other, and arranged in the same row of different touch sensing groups 106 arranged in the second direction D2. The fourth electrodes E4 are also electrically connected to each other. Therefore, the same row of electrode units arranged in the second direction D2 can be electrically connected to each other to form a third electrode string. Since the third electrode E3 and the fourth electrode E4, which are adjacent to each other and are electrically connected, are provided corresponding to the adjacent first electrode E1 and second electrode E2, respectively, each electrode unit can be respectively connected to the first electrode in the second direction D2 A part of the electrode E1 and a part of the second electrode E2 overlap and generate capacitive coupling, whereby the same electrode unit can form different sensing units with the first electrode E1 and the second electrode E2, that is, the adjacent first sense The sensing unit SU1 and the second sensing unit SU2 can be formed by coupling the same electrode unit to the adjacent first electrode E1 and second electrode E2, so that the number of pads of the touch sensing element 104 can be reduced. For example, when a single touch sensing group 106 has 20 sensing units, and the number of touch sensing groups 106 is 12, that is, taking 20□ 12 sensing units as an example, in this embodiment The touch sensing element 104 only needs 34 pads for transmitting and receiving signals, that is, the third electrode E3 and the fourth electrode E4 of all touch sensing groups 106 share 20/2=10 pads, each The first electrode E1 and the second electrode E2 in the touch sensing group 106 each use one pad, for a total of 10+2*12=34 pads. However, in the conventional touch sensing element, since each sensing electrode and each driving electrode must be electrically connected to corresponding pads, taking 20□12 sensing units as an example, it requires 264 pads, namely Each of the 20 sensing units in each touch sensing group 106, whether it is the third electrode E3 or the fourth electrode E4, requires one pad each; in addition, the first sensing unit in each touch sensing group 106 One pad is required for each of the electrode series and the second electrode series. A total of (20+2)*12=264 pads. Therefore, it can be seen that the touch sensing element 104 of this embodiment can greatly reduce the number of pads. It should be noted that the fourth electrode E4 adjacent to each third electrode E3 here refers to the fourth electrode E4 closest to each third electrode E3.

Further, each third electrode E3 and each fourth electrode E4 in this embodiment may be driving electrodes, respectively. Since each third electrode E3 and the adjacent fourth electrode E4 are electrically connected to each other to form an electrode unit, each electrode unit can be regarded as a single driving electrode, and each is used to receive a driving signal. Each first electrode E1 and each second electrode E2 may be sensing electrodes, respectively, for generating corresponding sensing signals due to capacitive coupling when the corresponding electrode unit receives the driving signal. For a single touch sensing group 106, when performing touch detection, the control element will sequentially send driving signals to each electrode unit, and the first electrode series formed from the first electrode E1 in series and The second electrode series formed by connecting the second electrodes E2 in series receives corresponding sensing signals. Since each electrode unit can be capacitively coupled with the first electrode E1 and the second electrode E2 to form different sensing units, when transmitting a single driving signal to an electrode unit, the corresponding first electrode E1 and second electrode E2 The induction signals can be generated separately to achieve the detection of the two sensing units. It can be seen that the touch sensing element 104 of this embodiment can effectively reduce the number of transmission driving signals and reduce the load of the control element. In another embodiment, each first electrode E1 and each second electrode E2 may also be driving electrodes, and each third electrode E3 and each fourth electrode E4 may be sensing electrodes, respectively. Those skilled in the art can understand that this operating characteristic can be applied to all the embodiments of the present invention, which will not be repeated below.

In detail, each two adjacent third electrodes E3 is disposed corresponding to one first electrode E1 and overlaps the corresponding first electrode E1 in the second direction D2, thereby forming two adjacent first sensing units SU1. Each two adjacent fourth electrodes E4 are disposed corresponding to one second electrode E2 and overlap with the corresponding second electrode E2 in the second direction D2, thereby forming two adjacent second sensing units SU2. Every two adjacent second sensing units SU2 and every two adjacent first sensing units SU1 are alternately arranged in sequence along the first direction D1, and the first sensing unit SU1 and the second sensing unit SU2 may be arrayed It can be arranged in a manner so as to perform touch detection on the position or movement track of the touched object. In addition, in this embodiment, the first electrode E1 and the second electrode E2 have a displacement in the second direction D2, and the adjacent third electrode E3 and the fourth electrode E4 also have the same displacement in the second direction D2. In this way, the first sensing unit SU1 and the second sensing unit SU2 of the single touch sensing group 106 can be arranged on a straight line to accurately detect the position of the touch object.

In this embodiment, the touch panel 100 may further include a plurality of third connection lines C3, which are disposed on one side of the touch sensing group 106, and each third electrode E3 is respectively transmitted through a corresponding third connection line C3. It is electrically connected to the adjacent fourth electrode E4. Specifically, the third connection line C3 can be disposed on the substrate 102 in the peripheral area PR, and is preferably provided on one end side of the touch sensing group 106, so that the third connection line C3 can extend along the second direction D2 In order to connect the third electrode E3 and the fourth electrode E4 in the same row in different touch sensing groups 106. For example, the third electrodes E3 in the same row can be electrically connected to each other through the same third connection line C3, and when the fourth electrode E4 in the same row is adjacent to the third electrode E3 in the same row, the third The four-electrode E4 is electrically connected to the adjacent third electrode E3 to the same third connection line. Further, each touch sensing group 106 may further include a plurality of fourth connection lines C4 extending from the sensing area SR to the peripheral area PR. Each third electrode E3 may be connected to the corresponding third connection line C3 through a corresponding fourth connection line C4, and each fourth electrode E4 may be connected to the corresponding third connection line C3 through the corresponding other fourth connection line C4 connection. In this embodiment, since each fourth connection line C4 extends along the first direction D1 and is only connected to the corresponding third connection line C3, part of the fourth connection line C4 will cross part of the third through the insulating structure The connection line C3 is insulated from the non-corresponding third connection line C3 and further connected to the corresponding third connection line C3. For example, the third connection line C3 and the fourth connection line C4 may be formed of different conductive layers, and an insulating layer may be provided therebetween, but not limited thereto. Through the design of the third connection line C3 and the fourth connection line C4, the same electrode unit is respectively disposed on a side of the first electrode E1 facing the first side S1 and a side of the second electrode E2 facing the second side S2 The third electrode E3 and the fourth electrode E4 on the side can be electrically connected to each other. Moreover, by arranging the third electrode E3 and the fourth electrode E4 on the side of the first electrode E1 facing the first side S1 and the side of the second electrode E2 facing the second side S2, two adjacent ones are connected The first connection line C1 of the first electrode E1 can extend from between the third electrode E3 and the second electrode E2 to the side of the second electrode E2 facing the first side S1, so it is not provided on the second electrode E2 and Between the fourth electrodes E4, thereby avoiding signal interference of the first connection line C1 or reducing the amount of change in capacitive coupling between the second electrode E2 and the fourth electrode E4. Similarly, the second connection line C2 may extend from between the fourth electrode E4 and the first electrode E1 to the side of the first electrode E1 facing the second side S2, so it will not be provided between the first electrode E1 and the first electrode Between the three electrodes E3, signal interference of the second connection line C1 can be avoided or the amount of change in the capacitive coupling between the first electrode E1 and the third electrode E3 can be reduced. In this way, the touch sensing element 104 of this embodiment can maintain a certain amount of capacitive coupling induction, that is, it can have superior touch induction, thereby reducing the interference of noise on the touch sensing element 104, and It can have a better signal-to-noise ratio (SNR), and can also cause each sensing unit to have a uniform amount of capacitive coupling to avoid touch sensitivity changing with position.

In addition, the width of the third electrode E3 in the first direction D1 is smaller than the width of the first electrode E1 in the first direction D1, and may be approximately half the width of the first electrode E1 in the first direction D1 , But not limited to this. The width of the fourth electrode E4 in the first direction D1 is smaller than the width of the second electrode E2 in the first direction D1, and may be approximately half the width of the second electrode E2 in the first direction D1, but Not limited to this. Preferably, the first electrode E1 and the second electrode E2 may have the same width in the first direction D1, and the third electrode E3 and the fourth electrode E4 may have the same width in the first direction D1, but not limited to this.

In this embodiment, the first electrode E1, the second electrode E2, the third electrode E3, the fourth electrode E4, the first connection line C1, the second connection line C2 and the fourth connection line C4 may be patterned with the same transparent conductive layer It is formed so that it can be placed on the same plane and has a so-called single-layer structure. The transparent conductive layer may be, for example, indium-tin oxide, indium zinc oxide (IZO), aluminum zinc oxide (AZO), or other transparent conductive materials.

The touch panel 100 may further include a plurality of first pads P1, a plurality of second pads P2, and a plurality of third pads P3. Each third connection line C3 can be extended to electrically connect to a corresponding first pad P1, and the first electrode E1 of each touch sensing group 106, that is, each first electrode series, can pass through wires from one end thereof It is electrically connected to the corresponding one of the second pads P2, and the second electrode E2 of each touch-sensing group 106, that is, the second electrode string, can be electrically connected to the corresponding one of the third electrodes through wires from one end thereof Pad P3. The touch panel 100 may further include a ground line G and a ground pad GP, wherein the ground line G may be disposed around the touch sensing group and disposed on the third connection line C3 and connects the second pad P2 and the first electrode string Between the wires in the row or between the third connecting wire C3 and the wires connecting the third pad P3 and the second electrode string to avoid the electrostatic damage of the touch sensing element and the first electrode E1 and the second electrode E2 is disturbed by the signal on the third connection line C3. The first pad P1, the second pad P2, the third pad P3 and the ground pad of the touch panel 100 may be electrically connected to the control element through a flexible circuit board for transmitting driving signals to the touch sensing element 104, and receive a sensing signal from the touch sensing element 104 to determine the position or action of the touch object.

For each of the first sensing unit SU1 or the second sensing unit SU2 of the mutual capacitance touch panel 100, the basis for being able to correctly determine the position or action of the touch object is that the entire mutual capacitance touch panel 100 has only the first A sensing unit SU1 or a second sensing unit SU2 corresponds to the pad corresponding to the driving electrode and the pad corresponding to the sensing electrode. Therefore, the logic of the present invention can be simplified as follows: 1. In the same touch sensing group 106, each third electrode E3 corresponding to the first electrode series must be connected to a different pad, corresponding to the second Each fourth electrode E4 of the electrode string must be connected to a different pad; 2. The third electrode E3 and the fourth electrode E4 adjacent to each other in the first direction D1 in the same touch sensing group 106 are Corresponding to the first electrode string and the second electrode string, respectively, and can be electrically connected to share the same pad; 3. Since the first electrode string and the second electrode string of different touch sensing groups 106 correspond to different The pads of the third electrode E3 and the fourth electrode E4, which are located in different touch sensing groups 106 and have the same position in the second direction D2, can be electrically connected to share the same pad.

It is worth noting that, since the third electrode E3 and the fourth electrode E4 adjacent to each other and electrically connected are respectively disposed on the side of the first electrode E1 facing the first side S1 and the second electrode E2 facing the second One side of the side S2, so the first electrode E1 and the second electrode E2 corresponding to each electrode unit can generate two sensing signals under a single driving signal to achieve the detection of the two sensing units, which can be effectively To reduce the number of transmission drive signals and reduce the load of control components. Furthermore, by electrically connecting the third electrodes E3 arranged in the same row of different touch sensing groups 106 in the second direction D2, and arranged in different touch sensing groups 106 in the second direction D2 The fourth electrodes E4 in the same row are electrically connected, and the number of first pads P1, second pads P2 and third pads P3 required by the touch sensing element 104 of this embodiment can be more effectively reduced. It can be seen that the number of pads of the touch panel 100 of this embodiment can be greatly reduced, which can not only reduce the load of the control element, but also save the manufacturing cost of the flexible circuit board and simplify its design. Moreover, through the design of the touch-sensing element 104 of this embodiment, the linearity of the touch-sensing element 104 when the touch object moves along a straight line can also be improved, and in the first direction D1 and the second direction D2 The above errors can be less than 1 mm.

The mutual-capacitive touch panel of the present invention is not limited to the above embodiment. The following will introduce the mutual-capacitive touch panels of other embodiments and modified embodiments of the present invention in order. In order to facilitate the comparison of the differences between the various embodiments and the modified embodiments and simplify the description, the following embodiments and The same symbols are used to mark the same elements in the various embodiments, and the differences between the embodiments and the various embodiments are mainly described, and the repeated parts will not be repeated.

Please refer to FIG. 2, which illustrates a schematic top view of a mutual-capacitive touch panel according to a second embodiment of the invention. To clearly show the structure of this embodiment, FIG. 2 only shows a part of the first sensing unit and the second sensing unit of a single touch sensing group, but the invention is not limited thereto. As shown in FIG. 2, the difference between the touch panel 200 of this embodiment and the touch panel of the first embodiment is that each first electrode E12 of each touch sensing group 206 of this embodiment includes a first connection Part CP1 and a plurality of first electrode fingers EF1, the first electrode fingers EF1 extend from the first connection part CP1 in the opposite direction of the second direction D2, so that the first electrode E12 is comb-shaped, and the comb-shaped first electrode The opening of E12 faces the opposite direction of the second direction D2. The third electrode E32 includes a second connection portion CP2 and a plurality of second electrode fingers EF2. The second electrode fingers EF2 extend from the second connection portion CP2 along the second direction D2, so that the third electrode E32 is also comb-shaped , And the opening of the comb-shaped third electrode E32 faces the second direction D2. Moreover, each second electrode finger EF2 extends between any two adjacent first electrode fingers EF1, so compared to the first embodiment, the distance between the first electrode E12 and the third electrode E32 in this embodiment The capacitive coupling area is higher to increase the coupling capacitance between the first electrode E12 and the third electrode E32. Similarly, each second electrode E22 includes a third connection portion CP3 and a plurality of third electrode fingers EF3, and the third electrode fingers EF1 respectively extend from the third connection portion CP3 along the second direction D2. Each fourth electrode E42 includes a fourth connection portion CP4 and a plurality of fourth electrode fingers EF4, and each fourth electrode finger EF4 extends from the fourth connection portion CP4 along the opposite direction of the second direction D2 to any two adjacent ones Between the third electrode finger EF3, so the coupling capacitance between the second electrode E22 and the fourth electrode E42 can also be increased, thereby further increasing the capacitive coupling induction of the touch sensing group 206 when detecting a touch object To improve the touch sensitivity of the touch panel 200. In this embodiment, the first electrode E12 and the second electrode E22 have no displacement in the second direction D2 and are arranged on a straight line. In another embodiment, the first electrode finger EF1 and the third electrode finger EF3 may also extend along the first direction D1, and the second electrode finger EF2 and the fourth electrode finger EF4 may respectively follow the first direction D1 Extend in the opposite direction.

Please refer to FIG. 3, which illustrates a schematic top view of a mutual-capacitive touch panel according to a third embodiment of the present invention. In order to clearly show the structure of this embodiment, FIG. 3 only shows part of the first sensing unit and the second sensing unit of a single touch sensing group, but the invention is not limited thereto. As shown in FIG. 3, the difference between the touch panel 300 of this embodiment and the touch panel of the second embodiment is that each touch sensing group 306 of this embodiment further includes a plurality of floating electrodes FE, which are disposed at Between each third electrode E32 and the corresponding first electrode E12 and between each fourth electrode E42 and the corresponding second electrode E22. By providing the floating electrode FE in the gap between the first electrode E12 and the third electrode E32 and the gap between the second electrode E22 and the fourth electrode E42, the first electrode E12 and the third electrode E32 can be effectively lifted Between the capacitive coupling inductance between the second electrode E2 and the fourth electrode E4 to further increase the touch sensitivity. In this embodiment, the first electrode E1 and the second electrode E2 are slightly displaced in the second direction D2. This is an adaptation result in which the first sensing unit SU1 and the second sensing unit SU2 of a single touch sensing group 106 can be arranged on a straight line, which can reduce the area of the touch sensing group 306 that is not filled by electrodes , And the touch sensing group 306 has a more regular shape, and accurately detects the position of the touch object.

Please refer to FIG. 4, which illustrates a schematic top view of a mutual-capacitive touch panel according to a fourth embodiment of the present invention. In order to clearly show the structure of this embodiment, FIG. 4 only shows part of the first sensing unit and the second sensing unit of a single touch sensing group, but the invention is not limited thereto. As shown in FIG. 4, the difference between the touch panel 400 of this embodiment and the touch panel of the first embodiment is that each first electrode E14 of the touch sensing group 406 of this embodiment includes two notches CC1, Facing the first side S1, that is, the recess CC1 is disposed in the opposite direction of the second direction D2, and two adjacent third electrodes E34 extend into the corresponding recess CC1, respectively. Further, each first electrode E14 includes two anchor portions A1, which are respectively disposed in corresponding recesses CC1, and each anchor portion A1 has two recesses CC2, which are disposed toward the second direction D2. Each third electrode E34 includes two hook-shaped portions H1 that extend into corresponding recesses CC2, thereby enhancing the coupling capacitance between the first electrode E14 and the third electrode E34. Similarly, each second electrode E24 includes two notches CC3 facing the second side S2, that is, the notch CC3 is disposed toward the second direction D2, and the two adjacent fourth electrodes E44 extend to the corresponding notches, respectively Within CC3. Further, each second electrode E24 includes two anchor portions A2, which are respectively disposed in corresponding recesses CC3. Each anchor portion A2 has two recesses CC4, which are disposed in the opposite direction of the second direction D2, and each fourth electrode E44 includes two hook portions H2, respectively extending into the corresponding recesses CC4. In this way, the capacitive coupling induction of the touch sensing group 406 when detecting a touch object can be improved, so as to improve the touch sensitivity of the touch panel 400.

Please refer to FIG. 5, which is a schematic top view of a mutual-capacitive touch panel according to a fifth embodiment of the present invention. In order to clearly show the structure of this embodiment, FIG. 5 only shows a part of the first sensing unit and the second sensing unit of a single touch sensing group, but the invention is not limited thereto. As shown in FIG. 5, the difference between the touch panel 500 of this embodiment and the touch panel of the fourth embodiment is that each first electrode E15 of this embodiment includes two hook portions H3 instead of anchor portions. Each hook portion H3 is provided in the corresponding recess CC1 and extends from the side wall of the recess CC1. For example, the shape pattern of the hook portion H3 of each first electrode E15 is symmetrical to the second direction D2, so the hook portion H3 respectively goes from the corresponding recess CC1 along the opposite direction of the first direction D1 to the first direction D1 Extending, the invention is not limited to this. In another embodiment, the hook portion H3 of each first electrode E15 may also have the same shape pattern. Specifically, the hook portion H3 of each first electrode E15 may have a notch CC5, and the notch CC5 respectively faces the first direction D1 and the opposite direction. Each third electrode E35 includes a spiral portion SP1 that extends into the corresponding recess CC5, thereby enhancing the coupling capacitance between the first electrode E15 and the third electrode E35. Similarly, each second electrode E25 may include two hooks H4, which are respectively disposed in the corresponding recesses CC3, and each hook H4 may extend from the side wall of the recess CC3 in a symmetrical second direction D2 , But not limited to this. In another embodiment, the hook portion H4 of each second electrode E25 may also have the same shape pattern. Each hook portion H4 has a recess CC6, and each fourth electrode E45 includes a spiral portion SP2 that extends into the corresponding recess CC6. In this way, the capacitive coupling induction of the touch sensing group 506 when detecting a touch object can be improved to improve the touch sensitivity of the touch panel 500.

In summary, in the mutual-capacitance touch panel of the present invention, the third electrode and the fourth electrode adjacent to each other are electrically connected to each other and respectively correspond to the adjacent first electrode and the second electrode, and thus constitute Each electrode unit may overlap a part of the first electrode and a part of the second electrode in the second direction, respectively. Moreover, by electrically connecting the third electrodes in the same row and electrically connecting the fourth electrodes in the same row, the number of pads required for the touch panel can be effectively reduced. This can not only reduce the load of the control element, but also save the manufacturing cost of the flexible circuit board and simplify its design, and improve the linearity of the touch panel when the touch object moves along a straight line. In addition, since the first connection line can extend to the side of the second electrode facing the first side, and the second connection line can extend to the side of the first electrode facing the second side, the first connection can be avoided The signal of the line and the second connection line interferes or reduces the amount of capacitive coupling between the second electrode and the fourth electrode and between the first electrode and the third electrode. The above are only the preferred embodiments of the present invention, and all changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the present invention.

100, 200, 300, 400, 500 ‧‧‧ touch panel
102‧‧‧ substrate
104‧‧‧Touch sensing element
106,206,306,406,506‧‧‧Touch sensing group
D1‧‧‧First direction
D2‧‧‧Second direction
C1‧‧‧ First connection line
C2‧‧‧Second cable
C3‧‧‧The third connection line
C4‧‧‧The fourth connection line
E1, E12, E14, E15 ‧‧‧ first electrode
E2, E22, E24, E25‧Second electrode
E3, E32, E34, E35 ‧‧‧ third electrode
E4, E42, E44, E45 ‧‧‧ fourth electrode
P1‧‧‧ First pad
P2‧‧‧Second pad
P3‧‧‧The third pad
S1‧‧‧First side
S2‧‧‧Second side
SU1‧‧‧The first sensing unit
SU2‧‧‧Second sensing unit
SR‧‧‧sensing area
PR‧‧‧ surrounding area
CP1‧‧‧First connection
CP2‧‧‧Second connection
CP3‧‧‧The third connection
CP4‧‧‧The fourth connection
EF1‧‧‧First electrode finger
EF2‧‧‧Second electrode finger
EF3‧‧‧third electrode finger
EF4‧‧‧Fourth electrode finger
FE‧‧‧floating electrode
CC1, CC2, CC3, CC4, CC5, CC6 notch
A1, A2‧‧‧Anchor
H1, H2, H3, H4
SP1, SP2

FIG. 1 is a schematic top view of a mutual-capacitive touch panel according to the first embodiment of the invention. FIG. 2 is a schematic top view of a mutual-capacitive touch panel according to a second embodiment of the invention. FIG. 3 is a schematic top view of a mutual-capacitive touch panel according to a third embodiment of the invention. FIG. 4 is a schematic top view of a mutual-capacitive touch panel according to a fourth embodiment of the invention. FIG. 5 is a schematic top view of a mutual-capacitive touch panel according to a fifth embodiment of the invention.

100‧‧‧Touch panel

102‧‧‧ substrate

104‧‧‧Touch sensing element

106‧‧‧Touch sensing group

D1‧‧‧First direction

D2‧‧‧Second direction

C1‧‧‧ First connection line

C2‧‧‧Second cable

C3‧‧‧The third connection line

C4‧‧‧The fourth connection line

E1‧‧‧First electrode

E2‧‧‧Second electrode

E3‧‧‧third electrode

E4‧‧‧The fourth electrode

P1‧‧‧ First pad

P2‧‧‧Second pad

P3‧‧‧The third pad

S1‧‧‧First side

S2‧‧‧Second side

SU1‧‧‧The first sensing unit

SU2‧‧‧Second sensing unit

SR‧‧‧sensing area

PR‧‧‧ surrounding area

Claims (18)

A mutual-capacitive touch panel includes: a substrate having a first side and a second side opposite to each other; and at least one touch sensing group extending on the substrate along a first direction, And the at least one touch sensing group includes: a plurality of first electrodes electrically connected to each other; a plurality of second electrodes electrically connected to each other, wherein each of the first electrode and each of the second electrodes are along the first direction Alternately arranged in sequence; a plurality of third electrodes are arranged along the first direction, and a third electrode is disposed on a side of the corresponding one of the first electrodes facing the first side, and in correspondence with the corresponding An electrode forms a first sensing unit; and a plurality of fourth electrodes, arranged along the first direction, and a fourth electrode adjacent to the third electrode is disposed at a corresponding one of the second electrodes facing the One side of the second side forms a second sensing unit with the corresponding second electrode, and the third electrode is electrically connected to the adjacent fourth electrode. The mutual-capacitive touch panel according to claim 1, wherein the at least one touch sensing group further includes a plurality of first connection lines and a plurality of second connection lines, each of the first connection lines is connected to any two Between the adjacent first electrodes and extending to a side where the corresponding one of the second electrodes faces the first side, and each of the second connecting lines is respectively connected to any two adjacent second electrodes Between the electrodes and extending to one side of the corresponding one of the first electrodes facing the second side. The mutual-capacity touch panel according to claim 1, comprising a plurality of the touch sensing groups, arranged along a second direction, and the touch sensing groups arranged in the same in the second direction The third electrodes are electrically connected to each other. The mutual-capacitive touch panel according to claim 3, further comprising a plurality of third connection lines, which are disposed on one side of the touch sensing groups, wherein the third electrodes in the same row are adjacent to the adjacent ones The fourth electrodes are electrically connected through the same third connection line. The mutual-capacitive touch panel according to claim 4, further comprising a plurality of first pads, a plurality of second pads, and a plurality of third pads, each of the third connecting wires is electrically connected to the corresponding One of the first pads, the first electrodes of each touch sensing group are electrically connected to a corresponding one of the second pads, and the second electrodes of each touch sensing group are electrically connected To the corresponding one of the third pads. The mutual-capacitive touch panel according to claim 4, wherein each of the touch sensing groups further includes a plurality of fourth connection lines, and each of the third electrodes can pass through a corresponding one of the fourth connection line and the corresponding The third connection line is electrically connected, and each of the fourth electrodes can be electrically connected to the corresponding third connection line through the corresponding another fourth connection line. The mutual-capacitive touch panel according to claim 1, wherein each of the first electrodes includes a plurality of first electrode fingers, the third electrode includes a plurality of second electrode fingers, and each of the second electrode fingers extends to Between any two adjacent first electrode fingers. The mutual-capacitive touch panel according to claim 1, wherein each second electrode includes a plurality of third electrode fingers, the fourth electrode includes a plurality of fourth electrode fingers, and each of the fourth electrode fingers extends to Between any two adjacent third electrode fingers. The mutual-capacitive touch panel according to claim 1, wherein the at least one touch sensing group further includes a plurality of floating electrodes disposed between each third electrode and the corresponding first electrode and each Between the fourth electrode and the corresponding second electrode. The mutual-capacitive touch panel according to claim 1, wherein each of the first electrodes includes two first notches facing the first side, and the two adjacent third electrodes extend to the corresponding one respectively Inside the first recess. The mutual-capacitive touch panel according to claim 10, wherein each of the first electrodes includes two anchor-shaped portions respectively disposed in the corresponding first recesses, and each of the anchor-shaped portions has two second recesses And each of the third electrodes includes two hook-shaped portions, respectively extending into a corresponding one of the second recesses. The mutual-capacitive touch panel according to claim 10, wherein each of the first electrodes includes two hook-shaped portions, which are respectively disposed in the corresponding first recesses, and each of the hook-shaped portions has a fifth recess And each third electrode includes a spiral portion extending into a corresponding one of the fifth recesses. The mutual-capacitive touch panel according to claim 1, wherein each of the second electrodes includes two third notches facing the second side, and the two adjacent fourth electrodes extend to the corresponding one respectively Inside the third recess. The mutual-capacitive touch panel according to claim 13, wherein each of the second electrodes includes two anchor-shaped portions, which are respectively disposed in the corresponding third recesses, and each of the anchor-shaped portions has two fourth recesses And each of the fourth electrodes includes two hook-shaped portions, respectively extending into a corresponding one of the fourth recesses. The mutual-capacitive touch panel according to claim 13, wherein each of the second electrodes includes two hook-shaped portions, which are respectively disposed in the corresponding third recesses, and each of the hook-shaped portions has a sixth recess And each of the fourth electrodes includes a spiral portion extending into a corresponding one of the sixth recesses. The mutual-capacitive touch panel according to claim 1, wherein the first electrodes, the second electrodes, the third electrodes, and the fourth electrodes of the at least one touch sensing group are patterned The same transparent conductive layer is formed. The mutual-capacitive touch panel according to claim 1, wherein each of the first electrode and each of the second electrodes is a sensing electrode, and each of the third electrode and each of the fourth electrodes is a driving electrode. The mutual-capacitive touch panel according to claim 1, wherein each of the first electrode and each of the second electrodes is a driving electrode, and each of the third electrode and each of the fourth electrodes is a sensing electrode.